Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities:
Net income	$ 3,810	$ 3,926
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	2,749	2,341
Gain on sale of fixed assets	(4)	(31)
Share-based compensation	642	647
Excess tax benefits on share-based compensation	(126)	(219)
Deferred income taxes	224	194
Changes in operating assets and liabilities:
Receivables, net	(5,539)	(3,048)
Inventories	318	61
Prepaid expenses	(1,665)	(1,000)
Refundable income taxes	832	2,932
Other assets	(35)	(44)
Accounts payable	865	(925)
Accrued expenses	(605)	924
Other liabilities	112	(71)
Net cash used in operating activities	1,578	5,687
Cash flows from investing activities:
Additions to property, plant and equipment	(4,360)	(10,461)
Proceeds from sale of fixed assets	4	31
Net cash used in investing activities	(4,356)	(10,430)
Cash flows from financing activities:
Principal repayments of long-term debt	(505)	(496)
Proceeds from the exercise of stock options, net of attestation	449	220
Excess tax benefit on share-based compensation	126	219
Payment of statutory withholdings for stock options exercised and restricted stock units vested	(89)	(79)
Net cash used in financing activities	(19)	(136)
Net decrease in cash and cash equivalents	(2,797)	(4,879)
Cash and cash equivalents at beginning of period	29,804	34,052
Cash and cash equivalents at end of period	$ 27,007	$ 29,173